CVE-2026-4224

· HIGHModified

← All CVEs

CVSS v3.1

7.5

CVSS v4.0

6.0

EPSS

0.64%

Published

Mar 16, 2026

Modified

Aug 4, 2026

Public PoC / Exploit

All weaponized →

No public PoC or exploit code indexed for this CVE.

Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

Description

When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-674

Affected Products (10)

python · python (up to 3.10.0)vulnerable

python · python (up to 3.13.13)vulnerable

python · python (up to 3.14.4)vulnerable

python · pythonvulnerable

References (10)

https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4a

Patch

https://github.com/python/cpython/commit/24ce88b285f56ee11626cf5e472af3cd8cc7c621

https://github.com/python/cpython/commit/642865ddf4b232da1f3b1f7abcfa3254c4bfe785

Patch

https://github.com/python/cpython/commit/af856a7177326ac25d9f66cc6dd28b554d914fee

Patch

https://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f3

Patch

https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf532768

Patch

https://github.com/python/cpython/issues/145986

Issue Tracking

https://github.com/python/cpython/pull/145987

Patch

https://mail.python.org/archives/list/security-announce@python.org/thread/5M7CGUW3XBRY7II4DK43KF7NQQ3TPZ6R/

Third Party Advisory

http://www.openwall.com/lists/oss-security/2026/03/16/4

Mailing ListThird Party Advisory

KEV Catalog EPSS Scores Vendors All CVEs